单项选择题

We use stamps to ______ letters.

A．write
B．carry
C．send
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单项选择题
The old man took his walking stick ______ went out.
A．but
B．and
C．or
单项选择题
— ______ do you write to your parents— Twice a month.
A．How long
B．How soon
C．How often
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